Chemical substance in LaTeX

[Mitrana Cristian]

Hello lyxers,
 I am trying to write a figure with some chemical 
substances, something like :
  _
/  \\
\\_/ 
and I was wondering if there is some (exotic) package
available for this kind of figures.If not, I'll have
to draw iy myself, but I was hoping somebody did that
already .
  Cristi

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